A system and method for preventing passivation of lithium sub-battery

Abstract

The invention relates to a system and a method for preventing a lithium thionyl chloride battery from being passivated. The system for preventing the lithium thionyl chloride battery from being passivated comprises a power supply, a single chip microcomputer, a pulse width adjusting circuit and a temperature detection circuit, wherein the power supply comprises a first power supply and a second power supply lithium thionyl chloride battery; the first power supply is used for supplying electricity to the single chip microcomputer, the pulse width adjusting circuit and the temperature detection circuit; both the pulse width adjusting circuit and the temperature detection circuit are connected with the single chip microcomputer; the pulse width adjusting circuit is used for transmitting the output voltage of the lithium thionyl chloride battery to the single chip microcomputer; the single chip microcomputer adjusts the discharge current of the lithium thionyl chloride battery by controlling the pulse width adjusting circuit; the temperature detection circuit is used for transmitting the detected temperature in an intelligent meter to the single chip microcomputer; and the single chip microcomputer selects the activation mode of the lithium thionyl chloride battery. The system and the method have the beneficial effects that generation of a passivation film can be retarded or avoided, so that the phenomenon that the lithium thionyl chloride battery with electricity cannot discharge is avoided; and normal operation of the intelligent meter is further ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a system and method for preventing passivation of lithium sub-batteries. Background technique [0002] The State Grid smart meter has the functions of two-way multi-rate metering, timing freezing, load recording, and power failure LCD display. powered by. At present, the clock battery used in domestic smart meters is mainly lithium argon sulfuryl chloride battery (hereinafter referred to as lithium sub-battery). Although this kind of battery has the advantages of high energy density, low self-discharge rate and long storage life, it also has voltage hysteresis. Shortcomings. [0003] The lithium sub-battery is composed of a strong oxidizing chemical substance, thionyl chloride electrolyte, which simultaneously acts as the electrolyte and the active material of the positive electrode of the battery. , immediately forming a dense passivation film on the sur...

AI Technical Summary

Problems solved by technology

When the battery is discharged or stored with a small current for a long time, the passivation film of the battery will gradually thicken, and the voltage hysteresis of the battery will also increase. In serious cases, the minimum voltage will drop to 2V or even lower, which will affect the smart meter. use

If no measures are taken on the circuit, the smart meter and other instruments will not be able to work normally due to the instantaneous voltage being too low

[0004] In the smart meter industry, the failure phenomenon caused by the battery is various, and the failure of the battery is mainly caused by the lag of the battery voltage. The lag of the battery voltage is due to the formation of a passivation film on the surface of the electrode. Functions such as time-sharing, tiered billing, and freezing cannot be implemented normally, resulting in serious failures of smart meters

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